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(No Model.) L. E. MOKINNON.

CARRIAGE TOP PROP.

Patented Mar. 23,1886.

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UNITED STATES PATENT OFFICE.

LAGHLAN E. MOKINNON, OF ST. OATHARINES, ONTARIO, CANADA CARRlAGE- TOP PROP.

SPECIFICATION forming part of Letters Patent No. 338,281, dated March 23, 1886.

Application filed November 7, 1885. Serial No. 182,123. (No model.)

To all whom it may concern:

Be itknown that I, LAOHLAN E. MoKINNoN, a citizen of the Dominion of Canada, residing at St. Gatharines, Province of Ontario, (Janada, have invented certain new and useful Improvements in Top Props for Carriages, of which the following is a specification.

My invention relates to that class of topprops having a separate stein screwed into a base-plate and a separate thimble or sleeve on the stem; and the object of my invention is to provide a prop with a separate stem,which at the same time is so arranged as to allow the thimble to be screwed down tight on the covering material of the carriage-top. I attain this object bythe special arrangement of parts illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of prop. Fig. 2 is a longitudinal section of same; and Fig. 3 is a top view of collar D, shown in Fig. 2.

Similar letters refer to similar parts in all the figures.

A represents the base-plate of prop, which is to be fastened to the carriage-bow.

B is the stem or stud which screws into the base-plate A.

O is an internally threaded boss projecting from the base-plate and receiving the externally-threaded end I) ofthe stem B. This projection or boss is made square or some other noncylindrical shape on the outside, and the part a of stem B, which forms a shoulder against the projection C, is also made square or noncylindrical.

D is a collar or washer made internally of such size and shape as to fit over the projection 0 and the adjoining part a of stem B in such a way as to prevent the stem B from unscrewing or working loose when collar D is in place.

E is a thimble or sleeve internally threaded at its outer end to screw on the threaded portion d of the stem B. At its inner end it is made internally of such shape and size as to fit over and hold in place the collar D. It is enlarged and flanged outwardly at its extreme inner end, so that when screwed up it may bear against the leather or other covering mafinish. It will be seen that by this arrangement I combine the advantages of the Thomas patent of September 22, 1857, and the Sawyer patent of May 15, 1866.

is, that the covering material must be stretched overthe end of the stem. The Sawyer prop and other loose stem-props, while avoiding that difficulty, have the disadvantage that the thirnble does not screw up tight against the covering material, and consequently they do My prop, as shown, has aseparate stem,which cannot work loose from the base-plate, and at the same time the thimble can (without the use of a separate nut for that purpose) be screwed up tight against the covering material, holding it in place and making a neat finish.

As mentioned above,I am aware that topprops have been made with a separate screw stem, and also that they have been made with a separate thimble to screw on the stem. I therefore do not claim either of these, nor even but What I do claim, and desire to secure by Letters Patent, is

The combination, in a top-prop,of the baseplate A, having a non-cylindrical projection, O,withthe collar D, fitting over the projection l, the screw-thimble E, covering and holding in place the collar D, and the stem 13, having a threaded part, b, screwing into the projection 0, a non-cylindrical part, a, adjoining the projection O, and a threaded part, d, on which the thimble E screws, all substantially as shown, and for the purposes specified.

LAOHLAN E. MOKIN N ON Witnesses:

ALEX. L. MITCHELL, W. A. NOIMAN.

The sole disadvantage of the Thomas prop terial, F, to hold it in place and complete the not make as neat afinish as the Thomas prop.

the combination of these two styles, broadly; 

